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Vitamin B6 (Pyridoxine HCL)
Pyridoxine Hydrochloride
An essential B vitamin that serves as a cofactor for over 100 enzyme reactions — including the synthesis of serotonin, dopamine, GABA, and norepinephrine. Critical for brain health, mood, energy metabolism, and cardiovascular function.
What Is It?
Vitamin B6 (Pyridoxine) is a water-soluble B vitamin found in foods like poultry, fish, potatoes, and bananas. It exists in several forms — the most active being Pyridoxal-5-Phosphate (P5P). Pyridoxine HCL is the most common supplemental form, which the body converts to P5P.
B6 is essential for protein metabolism, red blood cell production, and most critically — the synthesis of key neurotransmitters. Without adequate B6, the body cannot efficiently produce serotonin, dopamine, or GABA — directly impacting mood, cognition, and stress resilience.
B6 is essential for protein metabolism, red blood cell production, and most critically — the synthesis of key neurotransmitters. Without adequate B6, the body cannot efficiently produce serotonin, dopamine, or GABA — directly impacting mood, cognition, and stress resilience.
How It Works
Vitamin B6 functions as a coenzyme — meaning it activates enzymes that drive critical biochemical reactions. Its most important functions include:
- Neurotransmitter synthesis — essential cofactor for converting tryptophan to serotonin and tyrosine to dopamine
- GABA production — supports the synthesis of the brain's primary calming neurotransmitter
- Homocysteine metabolism — along with B12 and folate, B6 converts homocysteine (a cardiovascular risk marker) into beneficial compounds
- Hemoglobin synthesis — required for producing hemoglobin, which carries oxygen in red blood cells
- Immune function — supports lymphocyte production and immune response
- Neurotransmitter synthesis — essential cofactor for converting tryptophan to serotonin and tyrosine to dopamine
- GABA production — supports the synthesis of the brain's primary calming neurotransmitter
- Homocysteine metabolism — along with B12 and folate, B6 converts homocysteine (a cardiovascular risk marker) into beneficial compounds
- Hemoglobin synthesis — required for producing hemoglobin, which carries oxygen in red blood cells
- Immune function — supports lymphocyte production and immune response
Side Effects & Considerations
Vitamin B6 is very safe at standard doses but has a notable upper limit to be aware of:
- Very well tolerated at doses below 100mg daily
- High doses (200mg+ daily for extended periods) can cause peripheral neuropathy — numbness and tingling in hands and feet
- Water-soluble — excess is excreted in urine, making toxicity uncommon at supplemental doses
- May interact with certain medications including levodopa and some seizure medications
- Bright yellow urine is normal and harmless — indicates B vitamin metabolism
- The dose in H2O Cardio (4mg) is well within safe and effective range
- Very well tolerated at doses below 100mg daily
- High doses (200mg+ daily for extended periods) can cause peripheral neuropathy — numbness and tingling in hands and feet
- Water-soluble — excess is excreted in urine, making toxicity uncommon at supplemental doses
- May interact with certain medications including levodopa and some seizure medications
- Bright yellow urine is normal and harmless — indicates B vitamin metabolism
- The dose in H2O Cardio (4mg) is well within safe and effective range
Typical Dosage Range
400mcg – 1,000mcg daily
The RDA for folate is 400mcg for adults and 600mcg during pregnancy. Therapeutic doses of 1,000-15,000mcg are used clinically for depression and homocysteine reduction. The 100mcg dose in H2O Cardio provides meaningful cardiovascular support as part of the B vitamin complex. Look for products listing "5-MTHF" or "Methylfolate" rather than standard folic acid for maximum benefit.
Research Notes
- Malouf & Grimley (2003) — Cochrane review found B6 supplementation significantly improved memory and mood in older adults.
- Skarupski et al. (2010) — Study in American Journal of Clinical Nutrition found adequate B6, B12, and folate intake associated with significantly reduced risk of depression in older adults.
- Homocysteine Studies Collaboration (2002) — Meta-analysis demonstrated that B vitamin supplementation effectively lowers homocysteine — an independent cardiovascular risk factor.
- Larsson et al. (2008) — Study in JAMA found higher B6 intake associated with reduced risk of colorectal cancer.
- Skarupski et al. (2010) — Study in American Journal of Clinical Nutrition found adequate B6, B12, and folate intake associated with significantly reduced risk of depression in older adults.
- Homocysteine Studies Collaboration (2002) — Meta-analysis demonstrated that B vitamin supplementation effectively lowers homocysteine — an independent cardiovascular risk factor.
- Larsson et al. (2008) — Study in JAMA found higher B6 intake associated with reduced risk of colorectal cancer.
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.